<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>内外边距</title>
    <style>
        .box {
            width: 300px;
            height: 100px;
            background-color: rgb(43, 168, 226);
            text-align: center;
            /* border-radius: 100px; */
            /* 挨个设置某一边 */
            border-bottom-left-radius: 40px;
            border-top-right-radius: 40px;


        }

        .box2 {
            width: 200px;
            height: 200px;
            background-color: deeppink;
            text-align: center;
            border-radius: 50%;



        }
    </style>
</head>

<body>
    <div class="box">边框圆角</div>
    <div class="box2">圆形</div>
</body>

</html>